+++ /dev/null
-/*
- * Driver for batteries with bq27000 chips inside via HDQ
- *
- * Copyright 2008 Openmoko, Inc
- * Andy Green <andy@openmoko.com>
- *
- * based on ds2760 driver, original copyright notice for that --->
- *
- * Copyright © 2007 Anton Vorontsov
- * 2004-2007 Matt Reimer
- * 2004 Szabolcs Gyurko
- *
- * Use consistent with the GNU GPL is permitted,
- * provided that this copyright notice is
- * preserved in its entirety in all copies and derived works.
- *
- * Author: Anton Vorontsov <cbou@mail.ru>
- * February 2007
- *
- * Matt Reimer <mreimer@vpop.net>
- * April 2004, 2005, 2007
- *
- * Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
- * September 2004
- */
-
-#include <linux/module.h>
-#include <linux/param.h>
-#include <linux/jiffies.h>
-#include <linux/delay.h>
-#include <linux/pm.h>
-#include <linux/workqueue.h>
-#include <linux/platform_device.h>
-#include <linux/power_supply.h>
-#include <linux/bq27000_battery.h>
-
-enum bq27000_regs {
- /* RAM regs */
- /* read-write after this */
- BQ27000_CTRL = 0, /* Device Control Register */
- BQ27000_MODE, /* Device Mode Register */
- BQ27000_AR_L, /* At-Rate H L */
- BQ27000_AR_H,
- /* read-only after this */
- BQ27000_ARTTE_L, /* At-Rate Time To Empty H L */
- BQ27000_ARTTE_H,
- BQ27000_TEMP_L, /* Reported Temperature H L */
- BQ27000_TEMP_H,
- BQ27000_VOLT_L, /* Reported Voltage H L */
- BQ27000_VOLT_H,
- BQ27000_FLAGS, /* Status Flags */
- BQ27000_RSOC, /* Relative State of Charge */
- BQ27000_NAC_L, /* Nominal Available Capacity H L */
- BQ27000_NAC_H,
- BQ27000_CACD_L, /* Discharge Compensated H L */
- BQ27000_CACD_H,
- BQ27000_CACT_L, /* Temperature Compensated H L */
- BQ27000_CACT_H,
- BQ27000_LMD_L, /* Last measured discharge H L */
- BQ27000_LMD_H,
- BQ27000_AI_L, /* Average Current H L */
- BQ27000_AI_H,
- BQ27000_TTE_L, /* Time to Empty H L */
- BQ27000_TTE_H,
- BQ27000_TTF_L, /* Time to Full H L */
- BQ27000_TTF_H,
- BQ27000_SI_L, /* Standby Current H L */
- BQ27000_SI_H,
- BQ27000_STTE_L, /* Standby Time To Empty H L */
- BQ27000_STTE_H,
- BQ27000_MLI_L, /* Max Load Current H L */
- BQ27000_MLI_H,
- BQ27000_MLTTE_L, /* Max Load Time To Empty H L */
- BQ27000_MLTTE_H,
- BQ27000_SAE_L, /* Available Energy H L */
- BQ27000_SAE_H,
- BQ27000_AP_L, /* Available Power H L */
- BQ27000_AP_H,
- BQ27000_TTECP_L, /* Time to Empty at Constant Power H L */
- BQ27000_TTECP_H,
- BQ27000_CYCL_L, /* Cycle count since learning cycle H L */
- BQ27000_CYCL_H,
- BQ27000_CYCT_L, /* Cycle Count Total H L */
- BQ27000_CYCT_H,
- BQ27000_CSOC, /* Compensated State Of Charge */
- /* EEPROM regs */
- /* read-write after this */
- BQ27000_EE_EE_EN = 0x6e, /* EEPROM Program Enable */
- BQ27000_EE_ILMD = 0x76, /* Initial Last Measured Discharge High Byte */
- BQ27000_EE_SEDVF, /* Scaled EDVF Threshold */
- BQ27000_EE_SEDV1, /* Scaled EDV1 Threshold */
- BQ27000_EE_ISLC, /* Initial Standby Load Current */
- BQ27000_EE_DMFSD, /* Digital Magnitude Filter and Self Discharge */
- BQ27000_EE_TAPER, /* Aging Estimate Enable, Charge Termination Taper */
- BQ27000_EE_PKCFG, /* Pack Configuration Values */
- BQ27000_EE_IMLC, /* Initial Max Load Current or ID #3 */
- BQ27000_EE_DCOMP, /* Discharge rate compensation constants or ID #2 */
- BQ27000_EE_TCOMP, /* Temperature Compensation constants or ID #1 */
-};
-
-enum bq27000_status_flags {
- BQ27000_STATUS_CHGS = 0x80, /* 1 = being charged */
- BQ27000_STATUS_NOACT = 0x40, /* 1 = no activity */
- BQ27000_STATUS_IMIN = 0x20, /* 1 = Lion taper current mode */
- BQ27000_STATUS_CI = 0x10, /* 1 = capacity likely innacurate */
- BQ27000_STATUS_CALIP = 0x08, /* 1 = calibration in progress */
- BQ27000_STATUS_VDQ = 0x04, /* 1 = capacity should be accurate */
- BQ27000_STATUS_EDV1 = 0x02, /* 1 = end of discharge.. <6% left */
- BQ27000_STATUS_EDVF = 0x01, /* 1 = no, it's really empty now */
-};
-
-#define NANOVOLTS_UNIT 3750
-
-struct bq27000_bat_regs {
- int ai;
- int flags;
- int lmd;
- int rsoc;
- int temp;
- int tte;
- int ttf;
- int volt;
-};
-
-struct bq27000_device_info {
- struct device *dev;
- struct power_supply bat;
- struct power_supply ac;
- struct power_supply usb;
- struct delayed_work work;
- struct bq27000_platform_data *pdata;
-
- struct bq27000_bat_regs regs;
-};
-
-static unsigned int cache_time = 5000;
-module_param(cache_time, uint, 0644);
-MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
-
-/*
- * reading 16 bit values over HDQ has a special hazard where the
- * hdq device firmware can update the 16-bit register during the time we
- * read the two halves. TI document SLUS556D recommends the algorithm here
- * to avoid trouble
- */
-
-static int hdq_read16(struct bq27000_device_info *di, int address)
-{
- int acc;
- int high;
- int retries = 3;
-
- while (retries--) {
-
- high = (di->pdata->hdq_read)(address + 1); /* high part */
-
- if (high < 0)
- return high;
- acc = (di->pdata->hdq_read)(address);
- if (acc < 0)
- return acc;
-
- /* confirm high didn't change between reading it and low */
- if (high == (di->pdata->hdq_read)(address + 1))
- return (high << 8) | acc;
- }
-
- return -ETIME;
-}
-
-static void bq27000_battery_external_power_changed(struct power_supply *psy)
-{
- struct bq27000_device_info *di = container_of(psy, struct bq27000_device_info, bat);
-
- dev_dbg(di->dev, "%s\n", __FUNCTION__);
- schedule_delayed_work(&di->work, 0);
-}
-
-static int bq27000_battery_get_property(struct power_supply *psy,
- enum power_supply_property psp,
- union power_supply_propval *val)
-{
- int n;
- struct bq27000_device_info *di = container_of(psy, struct bq27000_device_info, bat);
-
- if (di->regs.rsoc < 0 && psp != POWER_SUPPLY_PROP_PRESENT)
- return -ENODEV;
-
- switch (psp) {
- case POWER_SUPPLY_PROP_STATUS:
- val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
-
- if (!di->pdata->get_charger_online_status)
- goto use_bat;
- if ((di->pdata->get_charger_online_status)()) {
- /*
- * charger is definitively present
- * we report our state in terms of what it says it
- * is doing
- */
- if (!di->pdata->get_charger_active_status)
- goto use_bat;
-
- if ((di->pdata->get_charger_active_status)()) {
- val->intval = POWER_SUPPLY_STATUS_CHARGING;
- break;
- }
- val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
- break;
- }
-
- /*
- * platform provided definite indication of charger presence,
- * and it is telling us it isn't there... but we are on so we
- * must be running from battery --->
- */
-
- val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
- break;
-
-use_bat:
- /*
- * either the charger is not connected, or the
- * platform doesn't give info about charger, use battery state
- * but... battery state can be out of date by 4 seconds or
- * so... use the platform callbacks if possible.
- */
-
- /* no real activity on the battery */
- if (di->regs.ai < 2) {
- if (!di->regs.ttf)
- val->intval = POWER_SUPPLY_STATUS_FULL;
- else
- val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
- break;
- }
- /* power is actually going in or out... */
- if (di->regs.flags < 0)
- return di->regs.flags;
- if (di->regs.flags & BQ27000_STATUS_CHGS)
- val->intval = POWER_SUPPLY_STATUS_CHARGING;
- else
- val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
- break;
- case POWER_SUPPLY_PROP_HEALTH:
- val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
- /* Do we have accurate readings... */
- if (di->regs.flags < 0)
- return di->regs.flags;
- if (di->regs.flags & BQ27000_STATUS_VDQ)
- val->intval = POWER_SUPPLY_HEALTH_GOOD;
- break;
- case POWER_SUPPLY_PROP_VOLTAGE_NOW:
- if (di->regs.volt < 0)
- return di->regs.volt;
- /* mV -> uV */
- val->intval = di->regs.volt * 1000;
- break;
- case POWER_SUPPLY_PROP_CURRENT_NOW:
- if (di->regs.flags < 0)
- return di->regs.flags;
- if (di->regs.flags & BQ27000_STATUS_CHGS)
- n = -NANOVOLTS_UNIT;
- else
- n = NANOVOLTS_UNIT;
- if (di->regs.ai < 0)
- return di->regs.ai;
- val->intval = (di->regs.ai * n) / di->pdata->rsense_mohms;
- break;
- case POWER_SUPPLY_PROP_CHARGE_FULL:
- if (di->regs.lmd < 0)
- return di->regs.lmd;
- val->intval = (di->regs.lmd * 3570) / di->pdata->rsense_mohms;
- break;
- case POWER_SUPPLY_PROP_TEMP:
- if (di->regs.temp < 0)
- return di->regs.temp;
- /* K (in 0.25K units) is 273.15 up from C (in 0.1C)*/
- /* 10926 = 27315 * 4 / 10 */
- val->intval = (((long)di->regs.temp * 10l) - 10926) / 4;
- break;
- case POWER_SUPPLY_PROP_TECHNOLOGY:
- val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
- break;
- case POWER_SUPPLY_PROP_CAPACITY:
- val->intval = di->regs.rsoc;
- if (val->intval < 0)
- return val->intval;
- break;
- case POWER_SUPPLY_PROP_PRESENT:
- val->intval = !(di->regs.rsoc < 0);
- break;
- case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
- if (di->regs.tte < 0)
- return di->regs.tte;
- val->intval = 60 * di->regs.tte;
- break;
- case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
- if (di->regs.ttf < 0)
- return di->regs.ttf;
- val->intval = 60 * di->regs.ttf;
- break;
- case POWER_SUPPLY_PROP_ONLINE:
- if (di->pdata->get_charger_online_status)
- val->intval = (di->pdata->get_charger_online_status)();
- else
- return -EINVAL;
- break;
- default:
- return -EINVAL;
- }
-
- return 0;
-}
-
-static void bq27000_battery_work(struct work_struct *work)
-{
- struct bq27000_device_info *di =
- container_of(work, struct bq27000_device_info, work.work);
-
- if ((di->pdata->hdq_initialized)()) {
- struct bq27000_bat_regs regs;
-
- regs.ai = hdq_read16(di, BQ27000_AI_L);
- regs.flags = (di->pdata->hdq_read)(BQ27000_FLAGS);
- regs.lmd = hdq_read16(di, BQ27000_LMD_L);
- regs.rsoc = (di->pdata->hdq_read)(BQ27000_RSOC);
- regs.temp = hdq_read16(di, BQ27000_TEMP_L);
- regs.tte = hdq_read16(di, BQ27000_TTE_L);
- regs.ttf = hdq_read16(di, BQ27000_TTF_L);
- regs.volt = hdq_read16(di, BQ27000_VOLT_L);
-
- if (memcmp (®s, &di->regs, sizeof(regs)) != 0) {
- di->regs = regs;
- power_supply_changed(&di->bat);
- }
- }
-
- if (!schedule_delayed_work(&di->work, cache_time))
- dev_err(di->dev, "battery service reschedule failed\n");
-}
-
-static enum power_supply_property bq27000_battery_props[] = {
- POWER_SUPPLY_PROP_STATUS,
- POWER_SUPPLY_PROP_HEALTH,
- POWER_SUPPLY_PROP_VOLTAGE_NOW,
- POWER_SUPPLY_PROP_CURRENT_NOW,
- POWER_SUPPLY_PROP_CHARGE_FULL,
- POWER_SUPPLY_PROP_TEMP,
- POWER_SUPPLY_PROP_TECHNOLOGY,
- POWER_SUPPLY_PROP_PRESENT,
- POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
- POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
- POWER_SUPPLY_PROP_CAPACITY,
- POWER_SUPPLY_PROP_ONLINE
-};
-
-static int bq27000_battery_probe(struct platform_device *pdev)
-{
- int retval = 0;
- struct bq27000_device_info *di;
- struct bq27000_platform_data *pdata;
-
- dev_info(&pdev->dev, "BQ27000 Battery Driver (C) 2008 Openmoko, Inc\n");
-
- di = kzalloc(sizeof(*di), GFP_KERNEL);
- if (!di) {
- retval = -ENOMEM;
- goto di_alloc_failed;
- }
-
- platform_set_drvdata(pdev, di);
-
- pdata = pdev->dev.platform_data;
- di->dev = &pdev->dev;
- /* di->w1_dev = pdev->dev.parent; */
- di->bat.name = pdata->name;
- di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
- di->bat.properties = bq27000_battery_props;
- di->bat.num_properties = ARRAY_SIZE(bq27000_battery_props);
- di->bat.get_property = bq27000_battery_get_property;
- di->bat.external_power_changed =
- bq27000_battery_external_power_changed;
- di->bat.use_for_apm = 1;
- di->pdata = pdata;
-
- retval = power_supply_register(&pdev->dev, &di->bat);
- if (retval) {
- dev_err(di->dev, "failed to register battery\n");
- goto batt_failed;
- }
-
- INIT_DELAYED_WORK(&di->work, bq27000_battery_work);
-
- if (!schedule_delayed_work(&di->work, 0))
- dev_err(di->dev, "failed to schedule bq27000_battery_work\n");
-
- return 0;
-
-batt_failed:
- kfree(di);
-di_alloc_failed:
- return retval;
-}
-
-static int bq27000_battery_remove(struct platform_device *pdev)
-{
- struct bq27000_device_info *di = platform_get_drvdata(pdev);
-
- cancel_delayed_work(&di->work);
-
- power_supply_unregister(&di->bat);
-
- return 0;
-}
-
-void bq27000_charging_state_change(struct platform_device *pdev)
-{
- struct bq27000_device_info *di = platform_get_drvdata(pdev);
-
- if (!di)
- return;
-}
-EXPORT_SYMBOL_GPL(bq27000_charging_state_change);
-
-#ifdef CONFIG_PM
-
-static int bq27000_battery_suspend(struct platform_device *pdev,
- pm_message_t state)
-{
- struct bq27000_device_info *di = platform_get_drvdata(pdev);
-
- cancel_delayed_work(&di->work);
- return 0;
-}
-
-static int bq27000_battery_resume(struct platform_device *pdev)
-{
- struct bq27000_device_info *di = platform_get_drvdata(pdev);
-
- schedule_delayed_work(&di->work, 0);
- return 0;
-}
-
-#else
-
-#define bq27000_battery_suspend NULL
-#define bq27000_battery_resume NULL
-
-#endif /* CONFIG_PM */
-
-static struct platform_driver bq27000_battery_driver = {
- .driver = {
- .name = "bq27000-battery",
- },
- .probe = bq27000_battery_probe,
- .remove = bq27000_battery_remove,
- .suspend = bq27000_battery_suspend,
- .resume = bq27000_battery_resume,
-};
-
-static int __init bq27000_battery_init(void)
-{
- return platform_driver_register(&bq27000_battery_driver);
-}
-
-static void __exit bq27000_battery_exit(void)
-{
- platform_driver_unregister(&bq27000_battery_driver);
-}
-
-module_init(bq27000_battery_init);
-module_exit(bq27000_battery_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
-MODULE_DESCRIPTION("bq27000 battery driver");
projects / openwrt / svn-archive / archive.git / blobdiff